<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <fieldset class="container">
    <legend class="align-center">Stack Controller</legend>
    <div class="pad blue"></div>
    <div class="pad blue">
      <div class="content">
        baz()
      </div>
    </div>
    <div class="pad blue"></div>
  </fieldset>

  <style>
    .align-center {
      text-align: center;
    }

  </style>

  <style>
    body {
      --primary-blue: #2bacf4;
      --primary-yellow: #f5ba1c;
      --primary-green: #37cf65;

      font-family: monospace, Cambria, Cochin, Georgia, Times, 'Times New Roman', serif;
    }

    .container {
      border: 2px solid black;
      padding: 0 4px;

      width: 320px;
    }

    .pad {
      margin: 4px 0;
      line-height: 32px;
      height: 32px;
      width: 100%;
    }

    .content {
      display: inline-block;
      background-color: white;
      margin: 0 24px;
      padding: 0 4px;
    }

    .blue {
      background-color: var(--primary-blue);
    }

    .yellow {
      background-color: var(--primary-yellow);
    }

    .green {
      background-color: var(--primary-green);
    }

  </style>
</body>

</html>
